import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: a1227
 * Date: 2022-09-02
 * Time: 21:48
 */
public class Text {
    //数位五五
    /*
    public static int sumOfOne(int n){
        if(n < 10){
            return n;
        }
        return sumOfOne(n / 10) + n % 10;
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        int count = 0;
        for(int i = a; i <= b; i++){
            int tmp = sumOfOne(i);
            if(tmp % 5 == 0){
                count++;
            }
        }
        System.out.println(count);
    }
    */
}
